Vermicomposting
The use of earthworms in composting process is known as vermicomposting. One kg of earthworms can consume one kg of organic materials in a day and excrete as castings that are rich in nitrate, available phosphorus, potassium, calcium and magnesium. The castings encourage growth of bacteria and actinomycetes due to aeration in soil pores.
There are about 3000 species of earthworms in the world and about 500 in India alone. The earthworm is an aerator by making tunnels and by crushing and mixing of soil.





